JPH0423846A - Styrene-based resin composition - Google Patents

Abstract

PURPOSE:To obtain a resin composition, excellent in flame retardancy, antistatic properties and scuff resistance and suitable as electronic and electrical equipment parts or automotive parts, etc., by blending a styrene-based resin with a halogen-based flame retardant, polyethylene glycol and a sodium soulfonate. CONSTITUTION:A resin composition is obtained by blending (A) 100 pts.wt. styrene-based resin (e.g. ABS resin or AS resin) with (B) 3-50 pts.wt., preferably 6-35 pts.wt. halogen-based flame retardant, (C), 0.1-10 pts.wt. polyethylene glycol having >=5000, preferably >=6000 molecular weight and (D) 0.1-8 pts.wt. sodium sulfonate (preferably sodium laurylsulfonate and sodium dodecylbenzenesulfonate) expressed by the formula (R is alkyl or aromatic residue which may have a substituent group) and, as necessary, adding a plasticizer, a heat stabilizer, a reinforcing agent, etc., thereto.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a styrenic resin composition, and more particularly, to a styrenic resin composition that has excellent flame retardancy and antistatic properties.

(Prior art and problems to be solved by the invention) Styrenic resins are used for various purposes due to their excellent processability and physical properties. There is an increasing demand for flame retardancy, antistatic properties, and scratch resistance in applications such as:

Many methods have been reported for independently imparting flame retardancy and antistatic properties to styrenic resins. However, imparting these two properties at the same time poses problems such as a decrease in flame retardancy.

(Means for solving the problem) As a result of intensive studies to obtain flame retardancy, antistatic properties, and superior resistance, we found that the above objectives were effectively achieved by blending a specific additive system with styrene resin. The present invention was achieved based on this discovery.

That is, the present invention includes (^) 100 parts of styrene resin, (B) 3 to 50 parts of halogen flame retardant, and (C) molecular weight 5.
,000 sides of polyethylene glycol 0.1~
10 parts, (D) 0.1-8 sodium sulfonate represented by the general formula R-8O"Na (wherein R is an alkyl group or an aromatic residue with or without a substituent) The object of the present invention is to provide a styrenic resin composition comprising:

In the present invention, styrene resins include polystyrene, styrene homopolymers such as polymethylstyrene, styrene-methylstyrene, styrene-divinylbenzene, and styrene-rubber (referred to as Hl polystyrene resin).
, styrene-acrylonitrile (referred to as AS resin).

), styrene-rubber-acrylonitrile (referred to as ABS resin, AC8 resin, AAS resin, AES resin).
or blends of these resins and other resins.

The halogen-based flame retardant used in the present invention is a bromine-based or chlorine-based flame retardant, such as tetrabromobisphenol A (T
BA), TBA carbonate oligomer, brominated bisphenol A type epoxy polymer, decabromodiphenyl ether, bis(tribromophenoxy)ethane, perchlorocyclopentadecane, tris(tribromoneopentyl)phosphate, and chlorinated paraffin. It is preferable to add 3 to 50 parts, particularly 6 to 35 parts of a mixture of one or two of these to 100 parts of styrenic resin. If the amount added is less than 3 parts, sufficient flame retardancy will not be obtained, and if it exceeds 50 parts, mechanical properties such as impact resistance will be greatly reduced, which is not preferable.

The polyethylene glycol used in the present invention has a molecular weight of 5,
Those on the 000 side, particularly on the e and ooo sides, are preferable. When the molecular weight is less than 5,000, the deflection temperature under load of the resulting ABS resin is significantly lowered, and the Izot impact strength is also lowered. The amount of polyethylene glycol added is 0.1
It is necessary to add 1 part to 10 parts. If the amount of polyethylene glycol added is less than 0.1 part, the antistatic property will not be sufficient and the scratch resistance will decrease. Moreover, if the amount of polyethylene glycol added exceeds 10 parts, it becomes difficult to dissolve in the styrene resin, resulting in delamination phenomenon, which is not preferable.

The sodium sulfonate used in the present invention is a sodium sulfonate represented by the general formula % (wherein R is an alkyl group or an aromatic residue with or without a substituent), where R is Straight-chain or branched alkyl groups having 8 to 22 carbon atoms or aromatic residues with or without straight-chain or branched alkyl groups having 8 to 22 carbon atoms are preferred, especially sodium lauryl sulfonate and sodium dodecylbenzenesulfonate. It is preferable to use

The appropriate amount of these sodium sulfonic acid salts to be added is between 0.1 and 8 parts; if it is less than 0.1 part, sufficient antistatic properties cannot be obtained, and if it exceeds 8 parts, the mechanical properties of the styrene resin will deteriorate significantly. This is not desirable.

Flame retardancy and antistatic properties can be imparted to styrene resin by adding flame retardants and sodium sulfonate salts, but this poses the problem of easy scratches that occur when molded products collide with each other. are doing. Therefore, by adding polyethylene glycol, it is possible to impart superiority and dramatically improve antistatic properties without reducing flame retardancy. That is, only by combining these three types can a styrenic resin with excellent flame retardancy, antistatic properties, and scratch resistance be obtained.

In addition, the composition of the present invention may be added with plasticizers, heat stabilizers, ultraviolet absorbers, pigments, dyes, etc., reinforcing agents such as glass fibers, glass beads, asbestos, etc., and flame retardants to the extent that does not impair the purpose of the present invention. Antimony trioxide can be included as an auxiliary agent.

The method for producing the composition of the present invention is not particularly limited, but a styrene resin, a halogen flame retardant, polyethylene glycol, and sodium sulfonate are simultaneously premixed and mixed using a single-screw kneading extruder or a twin-screw kneading extruder. , a Banbury mixer, a kneader, etc., and heat, melt, and knead the mixture. Furthermore, it can be processed into molded products for various uses by injection molding, compression molding, extrusion molding, etc.

(Example) Hereinafter, the present invention will be explained in more detail with reference to Examples.
The present invention is not limited to these examples.

Performance tests of the molded products described in the examples were performed according to the following method.

[Flame retardant] Underwriters Laboratory (USA) UL standard.

Flammability test based on UL-94 (3rd edition dated September 3, 1985).

[Antistatic properties] Injection molded at 200°C 50 x 50 n+
The surface resistivity of a 3 mar (thickness) square plate molded product was measured using a superinsulation resistor. (23°C, 65% RH atmosphere) [Scratch resistance] The higher the hardness of the molded products, the less likely they will be damaged by collisions between molded products, so ASTM test method D 78
Rockwell hardness was measured based on 5.

[Izotsu impact strength] Measured based on ASTM test method D256.

[Load deflection temperature] Measured based on ASTM test method D648.

Example 1 20% of tetrabromobisphenol A was added to 100 parts of a mixed resin in which an ABS resin containing 40% polybutadiene, 15% acrylonitrile, and 45% styrene was blended with an AS resin containing 30% acrylonitrile and 70% styrene in a 1:1 ratio. parts, antimony trioxide 7 parts, molecular weight 20,000
6 parts of polyethylene glycol and 2 parts of sodium lauryl sulfonate were added thereto, and the mixture was melted and mixed in a 40wΦ extruder (with a vent) at 200°C to form chips. Then, injection molding was performed at 200° C. to obtain a molded product, and a performance test was conducted. The results are shown in Table-1.

Example 2 T instead of tetrabromobisphenol A in Example 1
The same procedure as in Example 1 was carried out except that 25 parts of BA carbonate oligomer was used. The results are shown in Table 1.

Example 3 The same procedure as in Example 1 was carried out except that 25 parts of brominated bisphenol A epoxy polymer was used instead of tetrabromobisphenol A in Example 1.

The results are shown in Table-1.

Example 4 The same procedure as in Example 1 was carried out except that 20 parts of decabromodiphenyl ether was used instead of tetrabromobisphenol A in Example 1. The results are shown in Table-1.

Example 5 The same procedure as in Example 1 was carried out except that 25 parts of bis(tribromophenoxy)ethane was used instead of tetrabromobisphenol A in Example 1. The results are shown in Table-1.

Example 6 Example 1 except that 20 parts of perchlorocyclopentadecane and 15 parts of brominated bisphenol A epoxy polymer were used instead of tetrabromobisphenol A in Example 1.
I did the same thing. The results are shown in Table 1.

Example 7 Tris (tribromoneopentyl) phosphate was used in place of tetrabromobisphenol A in Example 1.
Example 1 was repeated except that 15 parts of brominated bisphenol A epoxy polymer and 15 parts of brominated bisphenol A epoxy polymer were used. The results are shown in Table-1.

Comparative Example 1 AB containing ABS resin containing 40% polybutadiene, 15% acrylonitrile, and 55% styrene and AS resin containing 45% acrylonitrile and 55% styrene in a 1:1 ratio.
A molded article was made by injection molding S resin at 220"C, and a performance test was conducted. As shown in Table 2, the flame retardancy, antistatic property, and scratch resistance were all poor.

Comparative Example 2 The same procedure as Comparative Example 1 was carried out except that 20 parts of tetrabromobisphenol A and 7 parts of antimony trioxide were added to 100 parts of the ABS/AS mixed resin of Comparative Example 1. As shown in Table 2, both antistatic properties and scratch resistance were poor.

Comparative Example 3 The same procedure as Comparative Example 2 was carried out except that 3 parts of fatty acid pentaerythritol (antistatic agent) was added to Comparative Example 2. As shown in Table 2, both flammability and scratch resistance were poor.

Comparative Example 4 The same procedure as Comparative Example 2 was carried out except that 2 parts of lauryltrimethylammonium chloride (antistatic agent) was added to Comparative Example 2. As shown in Table 2, both flammability and scratch resistance were poor.

Comparative Example 5 The same procedure as Comparative Example 2 was carried out except that 2 parts of sodium lauryl sulfonate was added to Comparative Example 2. As shown in Table 2, the scratch resistance was poor.

Example 8 The same procedure as in Example 1 was carried out except that 6 parts of polyethylene glycol having a molecular weight of 10.000 was added instead of the polyethylene glycol having a molecular weight of 20.0 (to) in Example 1.

The results are shown in Table-3.

Example 9 The same procedure as in Example 1 was carried out except that 6 parts of polyethylene glycol having a molecular weight of e and ooo was added instead of the polyethylene glycol having a molecular weight of 20.000. The results are shown in Table-3.

Example 10 The same procedure as in Example 1 was carried out except that 6 parts of polyethylene glycol having a molecular weight of Looo was added instead of the polyethylene glycol having a molecular weight of 20.000 in Example 1. The results are shown in Table-3.

Example 11 The same procedure as in Example 1 was carried out except that 2 parts of sodium dodecylbenzenesulfonate was added instead of sodium laurylsulfonate. The results are shown in Table-3.

(Effects of the Invention) As is clear from the detailed description, Examples, and Comparative Examples above, the composition of the present invention imparts flame retardancy, antistatic property, scratch resistance, etc. to styrenic resin, so it is less susceptible to dust. The present invention provides a material suitable for electronic and electrical equipment parts, automobile parts, etc., which may be contaminated with such substances.

Claims (1)

Scope of Claims: (A) 100 parts of styrene resin, (B) 3 to 50 parts of halogen flame retardant, (C) 0.1 to 10 parts of polyethylene glycol with a molecular weight of 5,000, (D ) 0.1 to 8 parts of sodium sulfonate represented by the general formula R-SO_3^+Na^- (wherein R is an alkyl group or an aromatic residue with or without a substituent), A styrenic resin composition characterized by: